CAJ | 학술논문

磷酸盐缓冲介质中,痕量Cu(Ⅱ)对过氧化氢氧化吖啶红的反应具有催化作用,导致吖啶红在550 nm处的荧光强度发生明显的猝灭,以此建立了测定痕量铜的新方法。在最优化条件下,方法的线性范围为8.0×10-4~9.2×10-3μg·mL-1,检出限为7.3×10-4μg·mL-1,用于水样及果皮样品中痕量Cu(Ⅱ)的测定,回收率在97.5%~103.5%之间。在40℃条件下,猝灭反应的活化能Ea=87 kJ·mol-1,表观速率常数k =1.05×10-3 s-1,且Cu(Ⅱ)对体系的荧光猝灭属动态猝灭。
린산염완충개질중,흔량Cu(Ⅱ)대과양화경양화아정홍적반응구유최화작용,도치아정홍재550 nm처적형광강도발생명현적졸멸,이차건립료측정흔량동적신방법。재최우화조건하,방법적선성범위위8.0×10-4~9.2×10-3μg·mL-1,검출한위7.3×10-4μg·mL-1,용우수양급과피양품중흔량Cu(Ⅱ)적측정,회수솔재97.5%~103.5%지간。재40℃조건하,졸멸반응적활화능Ea=87 kJ·mol-1,표관속솔상수k =1.05×10-3 s-1,차Cu(Ⅱ)대체계적형광졸멸속동태졸멸。
In a phosphate buffer solution, trace copper(Ⅱ) had a catalytic effect on oxidation reaction of acridine red by hydrogen peroxide. The fluorescence intensity of acridine red decreased with the increase of the concentration of copper(Ⅱ). A new method was established for determination of trace copper(Ⅱ). The linear range for the determination was between 8. 0×10-4 and 9. 2×10-3μg·mL-1, and the detection limit was 7. 3×10-4μg·mL-1. The proposed method was applied to the determination of trace copper in practical samples with satisfactory results and recovery rate was 97. 5% ~103. 5%. The apparent activation energy of the catalytic reaction was 87 kJ · mol-1 , and the apparent rate was 1. 05 × 10-3 s-1 under the condition of 40 ℃. The quenching mechanism was determined as dynamic quenching.